Someone who promises litte but delivers more than expected. Oft practiced by sandbagger

Captain: "Scotty! when can you get th ship moving again?"
Scotty: "Oh, 12 hours at least captain, gotta replace the crystals"
Captain: "Well, I guess we are all dead then, the sun will explode in 3 minutes"
Scotty: "I'll try Captain!"
Ship surges to life, all crew saved
Captain: "Scotty you old UPOD, I knew you were sandbagging me"
Scotty: " Sorry Cap, once an UPOD, always a UPOD!"

Dude: "Well, I got some seats for the game, here they are"
They sit down behind home plate
Chick: "You are such a UPOD, we got the best seats in the house"
Chick: " I may have to UPOD you later when we "just kiss""
Dude: "Sounds like an Epic Win for me!, UPOD does it every time!"